title: Wear of metal-free resin composite crowns after three years in service.
abstract: To compare differences between the wear behavior of two types of metal-free resin composite crown with a control after three years in clinical service. Sixty-six participants needing one to three posterior single crowns were fitted with 120 crowns. Abutment teeth were randomly assigned to three groups: 40 resin composite crowns with fiber-reinforced framework, 40 resin composite crowns without fiber-reinforced framework, and 40 metal-ceramic crowns. To assess wear, gypsum replicas of the crowns were fabricated and scanned with a 3D laser scanner at baseline and after three years. Differences between the groups were analyzed by use of mixed-effects regression models. Wear of resin composite crowns with fiber-reinforced framework (p=0.0043) and resin composite crowns without framework (p=0.0246) was significantly greater than in the metal-ceramic group. Wear of metal-free resin composite crowns after three years was significantly greater than that of metal-ceramic crowns, but the wear was still clinically acceptable.
authors.affiliation: University of Heidelberg, Dental School, Department of Prosthodontics.
authors.forename: Andreas
authors.initials: A
authors.lastname: Zenthöfer
authors.forename: Peter
authors.initials: P
authors.lastname: Rammelsberg
authors.forename: Clemens
authors.initials: C
authors.lastname: Schmitt
authors.forename: Brigitte
authors.initials: B
authors.lastname: Ohlmann
mesh_terms: D003442:Crowns; D019554:Dental Restoration Wear; D006801:Humans; D008670:Metals; D012117:Resins, Synthetic
chemical_list: D008670:Metals; D012117:Resins, Synthetic